Headlights not working

Discussion in 'Motoring' started by 7ofnine, Feb 20, 2014.

  1. 7ofnine

    7ofnine
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    What could cause both headlights to stop working? I checked the bulbs which appear to be ok. When I switch on I can hear the relay click in, but no light.
    The sidelights are working ok.

    Anything obvious I can check?
    Car: Focus 1.6 diesel.
     
  2. mjn

    mjn
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    checked the fuse?
     
  3. 7ofnine

    7ofnine
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    Thing is, both bulbs are on separate fuses. I suppose both could have blown, but it seems a bit strange.
     
  4. car-man

    car-man
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    Could be the headlight switch.

    Try wiggling the dip switch and see if the lights come on, btw, does main beam work?
     
  5. 7ofnine

    7ofnine
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    Yeah the main beam works, but on the dipped setting, no light.

    Is the headlight switch easily replaceable?

    Thing is, when I switch it from sidelights to headlights, I hear a click (relay?), so the switch is trying to activate something
     
  6. noiseboy72

    noiseboy72
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    Relay burned out? It will still click, but won't actually change state.

    If you have a meter, you can check it, or for the price, might just be worth getting a new one.
     
  7. 7ofnine

    7ofnine
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    Any idea where this relay is? I checked the engine bay aux fuse box, but looking at the diagram on the lid, it doesn't appear to have one present!
     
  8. 7ofnine

    7ofnine
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    This gets weirder. At the weekend I had the whole headlight assembly out. Disconnected headlight bulbs, reconnected, and the right one came on! So I know for sure that the bulb is working.
    But after restarting the car, it went back to not working.

    Could it be something shorting to earth somewhere?

    Think I'll have to get professional advice on this one, unless someone can suggest anything else I could check.
     
  9. Trollslayer

    Trollslayer
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    A bad earth connection is possibly the cause.
     
  10. 7ofnine

    7ofnine
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    Turned out this was a bulb problem, although in my defence, the filament was very slightly cracked, and intermittently making a connection. Well that's my story anyway :)
     

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